Stair.



No. 851,531. PATENTED M1123; 1907. J. LEA.

STA'IR.

. APPLICATION FILED JUNE 19,1906.

Wimes sea I avem r Jive 117 loa- JOSEPH LEA, OF TORONTO, ONTARIO, CANADA.

STAIR.

Specification of Letters Patent.

racemes April 23, 1907.

Application filed June'ilQ, 1906. Serial No. 322,477.

ments in Stairs, of which the following is the specification.

My invention relates to improvements in stairs, and the object of the invention'is to devise a simple, cheap and durable form of stairs, which may be erected as the building .proceeds and before completion, may be used without temporary treads, and which may be adapted to all buildings without material change of patterns, and the difficulty and the delay incident thereto.

Further objects are to make such a stairs as may be quickly erected, capable of being applied to any design of stairs, which will expand and contract with greater safety than a stair as at present built and will sustain a greater load .for'a given weight of niateria p I The invention consists of an interlocking riser and tread, the interlocking portion being located on the lon itudinal edge of both riser and tread, whic fit one within the other being in the formof a hollow bead, and a stringer of steel or other suitable material into or through which extend bolts,

. which pass through the stringer and thereby .support the interlocked riser and tread together. The treads may have hollow'beaded ed es through which and the stringers the bolts extend in order to support the treads in position between the stringers.

The parts are otherwise constructedand arranged in detail as hereinafter more particularly explained.

Figure 1 is a view of a portion of a stair constructed in accordance with my invenwhich are preferably tion. Fig. 2, is a longitudinal section through Fig. 1. Fig. 3, is an enlarged detail showing the interlocking of the riser and tread. Fi 4, is a view of a modification.

In the awings like letters of reference indicate corresponding parts in each figure. A are the stringers, which may be made of any suitable material preferably channel steel. The outside of the stringers may be ornamental, if desired, in any suitable manner.

B are the risers and C are the treads,

the bottom ofthe next riser.

steel. Each riser B is provided at the edge .with a hollow bead B and at the bottom with a hollow bead B The bead B is turned outwardly and the bead B inwardly. The tread is provided with a hollow nosing C at the front, which is adapted to fit closely over the hollow bead B at the top ofthe tread, -and a hollow molding C at the top, which is adapted to fit over the beadB at It will thus be seen that the risers and tread areinterlocked.

D is a bolt, which extends from stringer to stringer through the bead B, and the bolt being provided with washers E outside both stringers and nuts E fittin on to the threaded ends of the bolt and a utting the washers. D is a similar bolt extending through the hollow bead B and similarly secured at the outside by washers and nuts E and E respectively as indicated. It will now be seen that not only are the treads and risers held securely in position,.but also the stringers are held securely to the treads so as to make a rigid and strong structure.

Although I 'referably use the bolts extending througi the beads as hereinbefore described, it will be understood that lugs, projections or short bolts might extend into the beads and be secured therein, so as to hold the risers and treads together as well as the stringers to them wit from the spirit of my invention.

I preferably provide supplemental treads F, where the stair is to be used in good buildings. Such supplemental stair, of course, may be made of marble, slate, wood or any other suitable material.

In Fig. 4, I show treads C having the bead nosing C and back edge 0 are provided with suitable nuts and washers at the outside of the stringer. By such a construction I am enabled to make an open stairway at but a minimum expense.

Such a construction of stair as I describe will give a maximum s'tr'en th for a minimum weight of material use and it is'simple in construct-ion. The simplicity of adjustment of rise and go to suit all conditions render unnecessary the usual cost and delay of changing patterns for stringers and brackets to suit various heights of floors m a also made of plate A building.

out departing Through the nosing and back edge extend bolts E, which and nosing as and No temporary treads are required as the stair is erected with, the permanent tread, thus allowing the use of the stair as the building proceeds.

.The stair is necessarily a light one and all use of heavy cast iron is avoided.

In case of fire also the stair being a compact structure would expand and contract with greater safety than stairs built in the usual way held together by ordinary bolts and rivets.

It will also be understood from what has been heretofore described, that a stair constructedin accordance withiny invention will sustain a greater load for a given weight of material. 'Such a stair may be niadeof steel or any other suitable material.

"hat I claim as my invention is:

1. In a stair, the combination with the stringers of. treads having a hollow headed nosing, and means extending into the hollow nosing for maintaining the treads in position and securing the stringers together and to the treads as and for the purpose specified.

2. In a stair, the combination with a stringer, of treads having a hollow beaded nosing, and means extending into the hollow nosing for maintaining the treads in position and securing the stringers together, consisting of a bolt extending through the stringers for the purpose specified.

3. In a stair, the combination with the stringers, of treads extending between the same and having hollow curled or beaded nosings and backs, and means extending from the stringers into the nosing and hacks for supporting then! upon the stringers and connecting the stringers together and for the purpose specified.

4. In a stair, the combination with the stringers, of treads extending between the same and having hollow curled or beaded nosings and backs; and bolts extending l l l i l l l I l l l l through the hollow nosings and backs and connecting the stringers and treads together as and for the purpose specified.

In a ir, the combination with the 6. In a stair, the combination with the stringers, of the treads having a hollow nos ing and a curled or upwardly extending back edge, and therisers-having a hollow forwardly turned bead fitting within the nosing and a hollow rearwardly turned bead fitting within the curled back, and bolts extending through the hollow top and bottom beads of the riser, and fastening nuts or devices 10- cated in the outer ends of the bolts as and for the purpose specified.

7. In a stair, the combination with the stringers, of the treads having ahollow nosing and a curled or upwardly extending back edge and the risers having a hollow forwardly turned bead fitting within the nosing and a hollow rearwardly turned bead fitting within the curled back, and a supplemental tread suitably fastened for the purpose specified.

8. In a stair, the combination with the stringers, of the treads, and bolts connected to the treads and extending longitudinally in alinement therewith through the .stringers as and for the purpose specified.

JOSEPH LEA. Witnesses:

1 B. BOYD, I

E. MoEAoHERNI to the tread as and 

